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Summer nights and baby sleep don't always cooperate. If you've ever stood in the nursery at 2am wondering whether your little one is too warm, too cool, or somehow both — you're not alone. One of the most common questions we get from parents this time of year is simple: **what TOG sleep sack should I use in summer?**
The short answer: **0.5 TOG**. But we know parents deserve more than a number, so let's break it down properly.
## What Is TOG, Anyway?
TOG stands for *Thermal Overall Grade* — it's a measurement of how much warmth a fabric provides. The higher the TOG, the warmer the garment. Think of it like an SPF rating, but for heat retention.
Here's the quick reference chart:
| TOG Rating | Best For | Room Temperature |
|---|---|---|
| **0.5 TOG** | Summer / warm rooms | 24°C–27°C (75°F–81°F) |
| **1.0 TOG** | Spring / fall / mild rooms | 20°C–24°C (68°F–75°F) |
| **2.5 TOG** | Winter / cool rooms | 16°C–20°C (61°F–68°F) |
For summer 2026, a **0.5 TOG sleep sack** is your best friend — lightweight, breathable, and designed to keep baby comfortable without overheating.
## Why Overheating Is a Risk You Don't Want to Ignore
Pediatric sleep experts consistently flag overheating as one of the key environmental risk factors for unsafe infant sleep. Babies can't regulate their own body temperature the way adults can, which means they rely entirely on the sleep environment — and what they're wearing — to stay in their comfort zone.
A breathable, correctly rated sleep sack does two important jobs: it removes the need for loose blankets (a safe sleep win), and it keeps your baby's temperature steady throughout the night.
That's exactly why choosing the right TOG for the season matters so much.
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## Loulou Lollipop's 0.5 TOG Sleep Sacks: Award-Winning for a Reason
We're proud that Loulou Lollipop's sleep sacks were recognized by **Good Housekeeping** as a top pick for best sleep sack — an award that reflects not just the quality of our products, but the trust parents place in them night after night.
Our **0.5 TOG Muslin Sleep Sack** is built specifically for warm-weather sleep. Here's what sets it apart:
- **Tanboocel™ Muslin fabric** — made from bamboo tree pulp using a process that uses 99% less water than conventional cotton. It's ultra-soft, naturally breathable, and temperature-regulating.
- **Sleeveless design** — allows heat to escape from the arms and shoulders, the areas where babies lose the most body heat.
- **2-way zipper** — opens from the bottom for easy nighttime diaper changes without fully waking baby (or you).
- **Hip-healthy construction** — roomier at the bottom so little legs can move freely, supporting healthy hip development.
- **Gentle on sensitive skin** — free from harsh chemicals and dyes, ideal for babies with eczema or reactive skin.
The result is a sleep sack that works *with* warm summer nights rather than against them.
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## How to Dress Baby Under a 0.5 TOG Sleep Sack
TOG is only half the equation — what your baby wears underneath matters too. Here's a simple guide for summer:
**Room temp 24°C–27°C (75°F–81°F):**
→ Diaper only + 0.5 TOG sleep sack
**Room temp 22°C–24°C (72°F–75°F):**
→ Short-sleeve onesie + 0.5 TOG sleep sack
**Room temp below 22°C (72°F):**
→ Consider moving up to a 1.0 TOG, or add a light long-sleeve layer under your 0.5
A quick way to check if baby is comfortable: feel the back of their neck or their chest (not their hands or feet, which naturally run cooler). It should feel warm but not sweaty.
Common Summer Sleep Sack Questions
**Can I use a 1.0 TOG in summer if my house is air-conditioned?**
Yes — if your nursery stays consistently below 22°C (72°F) due to AC, a 1.0 TOG is appropriate. But if the temperature fluctuates overnight, stick with 0.5 and adjust the layer underneath instead.
**My baby sleeps hot — should I skip the sleep sack altogether?**
We'd recommend keeping the sleep sack and going lighter on the layer underneath rather than removing the sack entirely. Sleep sacks replace loose blankets and are an important part of a safe sleep setup.
**What age can my baby use a sleep sack?**
Loulou Lollipop sleep sacks are available from newborn (6–18 lbs) through to big kids (4Y+). We have TOG-appropriate options for every stage.
**How do I wash the muslin sleep sack?**
Machine wash cold, tumble dry low. The Tanboocel muslin actually gets softer with every wash.
## Our Summer 2026 Sleep Sack Picks
Looking for somewhere to start? These are our most-loved warm-weather options:
- **Muslin Lightweight Sleep Bag 0.5 TOG** — The summer essential. Available in a range of prints and solids.
- **Muslin Sleep Sack in Magical Dragons** — A new customer favourite, playful and perfect for the season.
All are available at louloulollipop.com
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The Bottom Line
For summer 2026, reach for the **0.5 TOG** — it's the right TOG for warm rooms, warm nights, and babies who run warm. Pair it with the right base layer, check that neck temperature test before bed, and you've got the recipe for a safe, comfortable sleep.
And if you're still not sure? Our team is always happy to help — drop us a note or DM us on Instagram. Because good sleep is a family affair, and we're here for all of it.
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*Loulou Lollipop's sleep sacks were named a top pick by Good Housekeeping. Shop our full sleep collection at louloulollipop.com